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Northwest Africa 1789
Basic information Name: Northwest Africa 1789
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1789
Observed fall: No
Year found: 1999
Country: (Northwest Africa)
Mass:help 44 g
Meteoritical Bulletin:  MB 88  (2004)  Eucrite-mmict
MetBase:  v. 7.1  (2006)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 275 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Revised 19 Dec 2015: Corrected shock stage
Writeup from MB 88:

Northwest Africa 1789

Northwest Africa

Purchased 1999 December 1

Achondrite (eucrite, monomict)

One complete crusted stone, weighing 44 g, was purchased in Morocco by H. Reyss. Classification and mineralogy (M. Bourot-Denise, MNHNP): fine recrystallized, gabbroic texture. Pigeonite (Fs56.5 Wo5.5) with exsolved augite (Fs27.4 Wo41.8) is associated with plagioclase (An83-87). Sulfide and ilmenite make up large grains; small metal grains are associated with oxides. All minerals, including silica, have rather jagged outlines. Shock stage S0, weathering grade W1. Specimens: type specimen 8.5 g, MNHNP; main mass with buyer.

Data from:
  Table 4
  Line 27:
Origin or pseudonym:Morocco
Place of purchase:Morocco
Date:P 1 Dec 1999
Mass (g):44.04
Class:Euc mm
Shock stage:S1
Weathering grade:W1
Classifier:M. Bourot-Denise, MNHNP. Magnetic measurements by P. Rochette, CEREGE, Marseille
Type spec mass (g):8.5
Type spec location:MNHN
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
MNHN: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
References: Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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